NSA/TWR/C1 - 40m and 20m Data Incorrect

A power distribution problem required us to shut down power to the 40m level.  All T/RH 
were missing and the 40m wind sensor did not have heat to remove any ice build up.  All 
wind data from the 40m level should be viewed critically before use.  The 20m T/RH sensor 
was power spike when the problem occurred causing this sensor to become erratic.  
See D100302.2 for the continuation of the 40m problem.

• wdir_vec_std
• rh_std
• qc_rh_mean
• qc_temp_mean
• qc_wspd_arith_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• vapor_pressure_mean
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• qc_wdir_vec_mean
• qc_dew_point_mean
• Mean Air Temperature or Hardware Error(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• dew_point_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• qc_vapor_pressure_mean

NSA/TWR/C1 - 40m level data incorrect

A power distribution problem required us to turn off the 50V DC power to the 40m level.  
This shutdown the T/RH probe and the heating of the ultrasonic sensor.  The wind data is 
useful at times when there is no icing present.  This DQR is a follow on to D091201.2 that 
was closed when the 20m level T/RH probe was replaced.

• wdir_vec_std
• rh_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• vapor_pressure_mean
• vapor_pressure_std
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• dew_point_mean
• Mean Air Temperature or Hardware Error(temp_mean)
• temp_std
• Wind speed vector mean(wspd_vec_mean)
• dew_point_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)

NSA/MET/C1 - CMH and 10m winds failure

At 0513GMT on 1/23 the atmos_pressure and CMH - temp, RH, DP & Sat. VP changed abruptly to 
unlikely values. The 10m winds failed at 1420GMT.

The CMH was repaired on 02/04/2010 at 2254GMT and the 10m winds sensor was replaced on 
02/05/2010 at 2100GMT.

• cmh_dew_point
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wspd_arith_mean
• qc_cmh_dew_point
• qc_wspd_vec_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• cmh_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• qc_wdir_vec_mean
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• qc_cmh_rh
• cmh_temp
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• cmh_rh

NSA/TWR/C1 - Wind sensor data failures

The wind speed and direction values for 2m, 10m and 20m dropped to zero at 14:20 GMT. The 
cause was a power failure due to failed power line.  Power spikes caused the wind sensors 
to revert to default settings for communications and measurements. The following is a 
list of dates that the various sensors came back online:
  2m wind problem ending on 01/28/2010 @ 2330GMT
 20m wind problem ending on 02/04/2010 @ 2230GMT
 10m wind problem ending on 02/05/2010 @ 2100GMT
  
40m winds were already failing and documented in DQPR 2262 and PIF P091030.1.  

The MET system was also affected and documented in DQPR 2337.

• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wdir_vec_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• qc_wspd_arith_mean
• Wind speed vector mean(wspd_vec_mean)
• qc_wspd_vec_mean

NSA/MET/C1 - CMH Data Missing

The GFCI had tripped causing the CMH to lose power.  All CMH variables are missing except 
CMHRH which reports 100% for the entire time.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH Sent to Vendor for Repair

CMH connector on the transmitter enclosure that goes to the head unit degraded and failed. 
 System was removed and sent to the manufacturer for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH offline

CMH removed for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - 10m wind sensor offline

The 10m wind sensor values were 0 m/s and 000 for wind direction. The sensor lost 
communications.

• qc_wdir_vec_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• qc_wspd_arith_mean
• wdir_vec_std
• qc_wspd_vec_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

NSA/MET/C1 - CMH offline

Beginning 1/24/2011, the CMH went offline resulting in missing temperature and dewpoint 
measurements and erroneous vapor pressure, saturation vapor pressure, and RH measurements. 

Problem fixed with a power cycle.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH Failure

The Chilled Mirror Hydrometer (CMH) developed a short in the wiring harness. All CMH data 
missing or incorrect during the period listed.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - Wind sensor data missing

2m, 10m, 20m wind sensors went off-line 5/17 due to GFCI tripping caused by failing CMH.   
The 2m and 20m data wind sensor returned 6/6, but the 10m remained offline until 7/20 as 
the sensor was damaged.

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)

• wdir_vec_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• Wind speed vector mean(wspd_vec_mean)

NSA/MET/C1 - 20m T/RH sensor failure

The 20m temperature and RH were erratic and incorrect resulting in incorrect vapor 
pressure calculations.  The sensor was damaged by voltage spikes on the power lines.

• dew_point_mean
• rh_std
• Mean Air Temperature or Hardware Error(temp_mean)
• temp_std
• vapor_pressure_mean
• vapor_pressure_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_std
• trh_err_code

NSA/MET/C1 - CMH communication failure

CMH lost communication with datalogger. All values from CMH were -6999 during this time 
resulting in the CMHRH flatlining at 100%. Communications was intermittent during entire 
time period.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH failure

Starting 14:17 GMT on 12/4/2011 the CMH Dew Point began reporting missing value, CMH 
relative humidity was flat-lining at 100% and CMH saturated vapor pressure was flat-lined at a 
high value.  This condition continued very intermittently for several months.  Issue was 
frosting and a failed ventilation fan.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure